The 1990 Yamaha YZ125 Air Box is a genuine Yamaha OEM part made in Japan. It features manufacturer part numbers 3SP-W1441-00-00 and 3JD-14453-00-00, specifically designed for the 1990 model year. This air box is a crucial component for maintaining proper air intake and fuel delivery in your motorcycle, ensuring optimal performance and efficiency on the roadVery good shape YOU WILL BE HAPPY!! retaining ring is also included but you cant see it in the pictures but it is there